I had a slightly elevated PSA this year of 3.2 - above the 2.5 limit that produces a follow up.
I went to the GP because, on two mornings, I had problems peeing. Other symptoms included back pain in the kidney area, shivers, and lethargy
The GP ordered a PSA test. A DRE showed an enlarged, but smooth, prostate.
4 weeks later, I did a second PSA test - this time I basically did nothing for 1 week prior - no sex or ejaculation (which was impossible anyway with my state of mind and anxiety) and the result was 2.2.
Because I had to wait 4 weeks after symptoms and before seeing a GP, my urine showed no infection, but the nurses here said any form of UTI would take 6 weeks to clear anyway.
I would suggest taking it easy in the week running up to your PSA test. No cycling, no strenuous exercising.
Make sure you get a DRE as well - but arrange for this to happen after the PSA test. A DRE can also cause an increase in PSA.
Good luck.